Study on NO x removal from simulated flue gas by an electrobiofilm reactor: EDTA-ferrous regeneration and biological kin
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RESEARCH ARTICLE
Study on NOx removal from simulated flue gas by an electrobiofilm reactor: EDTA-ferrous regeneration and biological kinetics mechanism Nan Liu 1
&
Ying-ying Li 1 & Du-juan Ouyang 1 & Rui Guo 2 & Run Chen 1 & Wei Li 3 & Ji-xiang Li 4,5 & Ji-hong Zhao 6
Received: 2 March 2020 / Accepted: 24 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The regeneration of EDTA-FeII is a key step in electrobiofilm reduction-integrated systems for NOx removal from industrial boiler flue gas. The current and carbon sources are proposed to be the two crucial electron donors for EDTA-FeII regeneration. These parameters strongly influence the reactivity of EDTA-FeII-generated products in the system. Therefore, their effects on EDTA-FeII-NO and EDTA-FeIII reduction and the EDTA-FeII generation mechanism were studied. The results showed that the electrobiofilm method has obvious advantages over biological or electrochemical methods used alone for EDTA-FeII regeneration. Under the optimal conditions at a current of 22.9A m−3 net cathode chamber, the rate of EDTA-FeII regeneration reached 98.35%. The glucose concentration is the primary factor influencing the reduction of both EDTA-FeII-NO and EDTA-FeIII, while the current significantly promotes both processes. Comparison of the Km values of the two substrates indicated that microbial activity was crucial to the reduction of EDTA-FeII-NO, but the biological reduction of EDTA-FeIII had a competitive influence on EDTA-FeII-NO reduction, which limited the abundance and effectiveness of the bacteria responsible for EDTA-FeII-NO reduction in the electrobiofilm system. Keywords Electrobiofilm . EDTA-FeII . NOx removal . Industrial boiler . Biological kinetics . Carbon source
Highlights • The regeneration of EDTA-FeII is a key step in electrobiofilm reductionintegrated systems. • The glucose concentration is the primary factor influencing the reduction of both EDTA-FeIII and EDTA-FeII-NO. • The presence of a current significantly promotes the reduction of both substances. • Microbial activity is crucial to the reduction of EDTA-FeII-NO. • The biological reduction of EDTA-FeIII has a competitive influence on EDTA-FeII-NO reduction. Responsible Editor: Vítor Pais Vilar * Wei Li [email protected]
3
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Yuquan Campus, Hangzhou 310027, People’s Republic of China
4
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, People’s Republic of China
5
University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
6
Henan Radio & Television University, Zhengzhou 450001, People’s Republic of China
* Ji-xiang Li [email protected] 1
2
China Key Laboratory of Light Industry Pollution Control and Recycling, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001,
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